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25 <br />the candidate sites. Information for these site characterizations will be obtained <br />from published soil surveys and geologic reports and from water well records kept <br />by State and local agencies. <br />S A E WATER <br />As with groundwater, the protection of surface waters used for <br />drinking water supplies or recreational purposes is a major factor in siting a <br />sanitary landfill. Surface waters can be adversely impacted from stormwater <br />runoff, leachate outcrops from a landfill, and subsurface discharge of <br />contaminated groundwater into the water course. These adverse impacts can be <br />mitigated by proper design and operation and monitoring of the facility; however, <br />the potential exists for degradation of surface waters due to human error or <br />neglect. <br />The impact on surface waters is a function of the distance of the landfill <br />from the water supply. Impact ratings are presented in Exhibit R -2B. The further <br />a site (i.e., a potential contaminant source) is from a water supply, the more likely <br />any contaminant release will be diluted or undergo biochemical degradation <br />before reaching the supply water. Thus, sites are assigned decreasing impact with <br />increasing distance away from water supplies. <br />Oaly downstream surface waters are considered. Continuous stream <br />reaches within 5 miles of the candidate sites are considered in the evaluation. <br />Use will be made of USGS topographic maps for this evaluation. <br />SOCT-O-ECONOM.IC <br />Placing a sanitary landfill in any given area will impact the socio - economic quality <br />of life and development of the surrounding areas. This category is subdivided into four <br />subcategories: <br />• Archaeological /Historical <br />Safety <br />